Combined servo-tracking and preload-controlling microactuator
US6590748B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2001 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Aug 21, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A dual-acting disc drive micro-actuator is formed of a stack of adjoining layers. The stack includes first through fifth layers. The first layer includes first and second spaced apart top electrodes. The second layer includes a first piezoelectric element electrically coupled to the first and second top electrodes. The third layer includes a center electrode electrically coupled to the first piezoelectric element. The fourth layer includes a second piezoelectric element electrically coupled to the center electrode. The fifth layer includes a first bottom electrode electrically coupled to the second piezoelectric element. The first and second piezoelectric elements are expandable and contractible in a common length direction in response to respective electrical fields applied between the center electrode and the first top electrode, the second top electrode and the first bottom electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.